11 Sep 2012 08:36. Edited 1 times. (Edit, Permalink)
Oops, I didn't realise that my home page was in the 'home' category. That category did have a nav:side page set. I've removed the sidebar from the 'navigation elements' section of my site manager, for the 'home' category.

However, I just figured out what the real problem was: I was pulling the theme from one of my other sites, which I switched to private mode earlier today. That had the side effect of blocking access to the CSS theme stored there.

If I log out, then clear my cache and reload, the site theme breaks in Google Chrome too.